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Check all the usual tuneup parts; coils/plugs/sensors...if nothing changes, do a compression test. Not uncommon for those motors to bend a valve and loose all compression in one cylinder, causing missfire (sometimes almost unnoticable in the way engine runs, other than CEL).

Thank you my friends, I have changed the plugs, got a new coil pack and check each one all good, checked injector its find, next will do a comp. test and see where we stand. u guys are right its running on 7 cyl. and go like nuts, i love this this car. thank you.